The XEqualRegion
function returns True if the two regions have the same offset, size,
and shape.

The XPointInRegion function returns True if the point (x,
y) is contained in the region r.

The XRectInRegion function returns RectangleIn
if the rectangle is entirely in the specified region, RectangleOut
if the rectangle is entirely out of the specified region, and RectanglePart
if the rectangle is partially in the specified region.